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4.[1]Sitting in class one afternoon,you feel your nose begin to run.As you wonder if you're catching a cold,you are shocked to see blood on the tissue(纸巾)you're using!You have a nosebleed.
[2]Don't worry.Nosebleeds are always easy to stop.Get some tissues or a damp cloth to catch the blood.Sit or stand so that your head is above your heart.Move your head forward and squeeze the soft part of your nose together just below the bony (骨头突出的) center.Applying pressure helps stop the flow of blood,and the nosebleed will usually stop after 10minutes of steady pressure don't keep checking to see if the bleeding has stopped.
[3]If you've tried the steps described above twice and the bleeding continues,you'll need to see a doctor.Once you've stopped bleeding,don't lift heavy objects or do sports that make you tired,and try not to blow your nose for 24hours.
[4]With your nosebleed over,let's learn more about nosebleeds.The most common kind is an anterior(前部的) nosebleed,whose most common cause is dry air.It also occurs after repeated blowing when you have a cold.
[5]Another kind is a posterior (后部的) nosebleed,which comes from the deepest part of the nose.Blood from a posterior nosebleed flows down the back of the throat even if you are sitting or standing.Teens seldom have posterior nosebleeds,which occur most often in older people,people with high blood pressure,or who have had nose or face injuries.
[6]Nosebleeds usually are not severe,but frequent nosebleeds might suggest a serious problem.If you get nosebleeds frequently--more than once a week you should see a doctor.
46.What is the main idea of Paragraph 2?
How to stop nosebleeds. (within 6words)
47.What are the three things that you had better not do within 24hours of a nosebleed?
①lift heavy objects②do sports③blow your nose(within 10words)
48.What is the most common cause of the most common kind of nosebleeds?
Dry air.  (within 4words)
49.Which kind of nosebleed occurs mainly among older people?
Posterior nosebleeds (within3words)
50.How often do you catch nosebleeds so you should see a doctor?
More than once a week.  (within 5words)

分析 短文主要介绍了当流鼻血的时候,应该怎么做能制止这种现象,同时介绍了在流鼻血后应注意什么事项,最后介绍了流鼻血分为前部的和后部的,如果是经常发生这种现象的话,就应该及时看医生.

解答 46.How to stop nosebleeds.主旨大意题,第二段主要讲了当你流鼻血的时候,应用纸巾或者湿布擦掉血,并保持站着或坐着的姿势,并且捏住鼻子上柔软的部分大概十分钟就能制止住流鼻血,因此主要讲了如何抑制流鼻血.
47.lift heavy objects,do sports,blow your nose.细节理解题,根据第三段don't lift heavy objects or do sports that make you tired,and try not to blow your nose for 24hours,可知流鼻血后24小时内不要做的事情就是lift heavy objects,do sports,blow your nose.
48.Dry air.细节理解题,根据第四段The most common kind is an anterior(前部的) nosebleed,whose most common cause is dry air.可知答案为Dry air.
49.Posterior nosebleeds.细节理解题,根据第五段Teens seldom have posterior nosebleeds,which occur most often in older people可知"老年人一般是后部的流鼻血".
50.More than once a week.细节理解题,根据最后一段If you get nosebleeds frequently--more than once a week you should see a doctor 可知答案.

点评 题目涉及多道细节理解题,做题时结合原文和题目有针对性地找出相关语句进行分析,结合选项找出正确答案,主旨大意题是要抓住关键语句对文章进行理解,才能得出正确答案,切忌胡乱猜测,一定要做到有理有据.

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